Problems with my Tri-Vista 300--Need some help

Dear Wasline,
It is called 5703 tube. Tube world sells them for 9.99. They are still used in microphones. Frankly I would be suspicious of the tech who told you they went bad. If they did there is probably something very wrong with the amp.

Get a second opinion from another repair shop.
I live in Asia and there is no end to the scams.
Gotta keep your BS Meter set on high sensitivity at all times.
The estimated problems could be exagerated by the repair man in an attemt to get his hands on this amp.
Did he offer to buy it from you?
I would not be suprised if it was just a fuse.

thanks for all the replies, everybody. We don't need to get into the merits or lack thereof of MF gear. I think they make great stuff and have a lot of integrity. But this is a rather odd problem that shouldn't be happening with a new piece of gear.

Merganser, I too, thought there were only four tubes in the amp located in the preamp stage. that's what I saw when I opened it up, but he said there were two more. Very strange. I'm going to the shop tomorrow to check out the problem. And I suspect you are very right about the source selector.

Jeffjarvis, I checked all the fuses out and the problem isn't there. While there are scams in many places in the world, I sincerely don't think this is the problem here. this guy does an incredible amount of repairs in this market with all kinds of gear.

thanks for all of your concern. I'll keep you posted as to how all of this develops. Best wishes on the new year.

Quick update. Looks like the local repair guy will be able to replace the tubes without a hitch. He tested them and said two were faulty. Called MF and they said it was their first experience with such a thing. Meanwhile, I have an order in with a tube company out of Chicago, which is temporarily out of stock. Also checked with two other companies, including Tubeworld, both out of stock. Tubeworld told me to check back in a month!

So the latest is that I'm having to wait an inordinate amount of time because the seemingly readily available tubes have been bought out for the time being. Amp has been waiting in the shop now for two weeks. Anybody have a couple of tubes to spare me? Thanks.

Washline
But cant MF supply you with the spare tubes ? I thought they had one extra set per amp manufactured or was it the Nu Vistas ? I cant remember....Perhaps you can try Wim Bouwman at Mr Valve in South Africa,my local tube supplier,chances are slim but I think worth a shot ...mail is bouwman@telkomsa.net
Chris